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Vitamin B12 injections can help bolster your immune system, making it easier for your body to fend off infections
Recent studies in humans, dogs, and cats suggest that oral supplementation is as equally effective as parenteral supplementation
It is essentially a synthetic version of thymosin beta-4, a protein located in the thymus gland
But people who are generally healthy and eat a balanced diet probably do not need to bother, says Lothar Rink, PhD, a zinc researcher and director of the Institute of Immunology at RWTH Aachen University in Germany
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